If you keep naming your classes, methods, parameters and variables consistently and their names express their purpose, your code without comments is easy to understand even for beginners.
Sometimes comments are necessary to describe and point to code that does not work in an expected way, and you have implemented strange looking workaround. For example some libraries, used in your project may have side-effects and wrong behavior and to overcome these problems, you have to write strange-looking code. And in this case comment helps to understand what is going on.
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If you keep naming your classes, methods, parameters and variables consistently and their names express their purpose, your code without comments is easy to understand even for beginners.
Sometimes comments are necessary to describe and point to code that does not work in an expected way, and you have implemented strange looking workaround. For example some libraries, used in your project may have side-effects and wrong behavior and to overcome these problems, you have to write strange-looking code. And in this case comment helps to understand what is going on.